In Italy we feel bad throwing away even old wine, so we color our pasta water with it to get a little aroma of wine and a dramatic presentation. The flavor of the wine is in the water but you're not going to feel it, and you give leftover wine a last chance to be useful. The more wine you use, the redder the spaghetti will be—and this dish is all about the presentation, so you can use up to a whole bottle depending on how much you have around. You can also always buy an inexpensive bottle just...Full Story